// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_POINT_BASE_H_
#define UI_GFX_GEOMETRY_POINT_BASE_H_

#include <string>

#include "base/compiler_specific.h"
#include "build/build_config.h"
#include "ui/gfx/gfx_export.h"

namespace gfx {

// A point has an x and y coordinate.
template <typename Class, typename Type, typename VectorClass>
class GFX_EXPORT PointBase {
public:
    Type x() const { return x_; }
    Type y() const { return y_; }

    void SetPoint(Type x, Type y)
    {
        x_ = x;
        y_ = y;
    }

    void set_x(Type x) { x_ = x; }
    void set_y(Type y) { y_ = y; }

    void Offset(Type delta_x, Type delta_y)
    {
        x_ += delta_x;
        y_ += delta_y;
    }

    void operator+=(const VectorClass& vector)
    {
        x_ += vector.x();
        y_ += vector.y();
    }

    void operator-=(const VectorClass& vector)
    {
        x_ -= vector.x();
        y_ -= vector.y();
    }

    void SetToMin(const Class& other)
    {
        x_ = x_ <= other.x_ ? x_ : other.x_;
        y_ = y_ <= other.y_ ? y_ : other.y_;
    }

    void SetToMax(const Class& other)
    {
        x_ = x_ >= other.x_ ? x_ : other.x_;
        y_ = y_ >= other.y_ ? y_ : other.y_;
    }

    bool IsOrigin() const
    {
        return x_ == 0 && y_ == 0;
    }

    VectorClass OffsetFromOrigin() const
    {
        return VectorClass(x_, y_);
    }

    // A point is less than another point if its y-value is closer
    // to the origin. If the y-values are the same, then point with
    // the x-value closer to the origin is considered less than the
    // other.
    // This comparison is required to use Point in sets, or sorted
    // vectors.
    bool operator<(const Class& rhs) const
    {
        return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_);
    }

protected:
    PointBase(Type x, Type y)
        : x_(x)
        , y_(y)
    {
    }
    // Destructor is intentionally made non virtual and protected.
    // Do not make this public.
    ~PointBase() { }

private:
    Type x_;
    Type y_;
};

} // namespace gfx

#endif // UI_GFX_GEOMETRY_POINT_BASE_H_
